New Zealand Mud Snail Latest Of At Least 186 Invasive Species Affecting Great Lakes Systems

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Scientists won't know for some time how well the mud snail will do in Lake Michigan, but it has been in Lake Ontario since the early 1990s and lives in high numbers there and in Lakes Superior and Erie, said Rochelle Sturtevant, an ecologist with the National Oceanographic and Atmospheric Administration's Great Lakes Environmental Research Laboratory in Ann Arbor, Mich.

The snail is native to New Zealand but is now found in several western states and all the Great Lakes except Lake Huron. It is carried in ships' ballast water and, once in lakes and streams, hitches a ride on boats and even the clothes worn by human waders. "Where they've gotten into streams in the western part of the country, they've caused a lot of problems," said Sturtevant. "They're taking over space that should have other native species living in it."

Plenty of invasive species have made homes for themselves in the Great Lakes. Zebra and quagga mussels are a threat to the region's $4 billion-a-year fishery, eating up algae that is the lowest link in the lakes' food chain. And some invasive species make it possible for others to follow, Sturtevant said. The round goby, an aggressive fish native to Eurasia, now thrives in the Great Lakes because it eats zebra mussels.

Those are just a handful of what Sturtevant says are now at least 186 invasive species in the lakes.

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http://seattlepi.nwsource.com/national/1501ap_sci_lake_michigan_invasive_snail.html

[DCKit]

1. Pics of the little (really little) buggers: